I have problems with my 640x480 tft display

kristjan1111

I got myself a tft 640x480 display. I connected it to the tv pin. I got the output but the text was very wavey and not understandable at some points (maybe refreshrate problems?) But now when i looked at the resolution settings there was no TFT option and the resolution was set to default which was 720 something. So i changed the resolution to 640x480 and It didn't output to my tft display, the output was changed to the HDMI not the TV pin.

Any fixes to those problems?bolded text

ballboff

Are you using the composite? Even though it's a tft, it isn't set up the same way as a hdmi display. You'll most likely need the settings for a CRT configuration. 480p would be the resolution needed and most likely 50 or 60hz.

kristjan1111

@ballboff Do you have a idea of how can i do such thing? And im running it from a composite video out (the tv pin on the raspberry pi)

ballboff

@kristjan1111 said in I have problems with my 640x480 tft display:

@ballboff Do you have a idea of how can i do such thing? And im running it from a composite video out (the tv pin on the raspberry pi)

you'll need to change the config.txt file.

sdtv_mode=2
sdtv_aspect=1
sdtv_disable_colourburst=0
framebuffer_width=640
framebuffer_height=480
overscan_left=27
overscan_right=0
overscan_top=0
overscan_bottom=0

I'm not 100% on these, so someone might need to check this out and I'm not sure if that's all you need.

kristjan1111

EDIT

kristjan1111

@ballboff Thank you very much for that, because my screen text looks a little bit nicer and easier to read, THO i have a new problem I may need to enable overscan and the screen is flikkering a little bit (maybe it's the screens fault) And the last thing the words and the screen has a litttle bit of flikering [maybe framerate problem] does anyone know about how to fix screen flickering?

ballboff

@kristjan1111 said in I have problems with my 640x480 tft display:

@ballboff Thank you very much for that, because my screen text looks a little bit nicer and easier to read, THO i have a new problem I may need to enable overscan and the screen is flikkering a little bit (maybe it's the screens fault) And the last thing the words and the screen has a litttle bit of flikering [maybe framerate problem] does anyone know about how to fix screen flickering?

I'd just check the specs of your screen. That refresh rate might not be correct, I made an assumption that 60hz would work ok, as it does with most screens. Yours might be different.

kristjan1111

@ballboff My screen box says that the resolution is 640x480 but it does not say at what hz it is can I change hz thru the config file?

ballboff

@kristjan1111 said in I have problems with my 640x480 tft display:

@ballboff My screen box says that the resolution is 640x480 but it does not say at what hz it is can I change hz thru the config file?

not directly, but where it says stv mode, you have to change that to correspond with the display mode you want. e.g. I think mode 1 is VGA, which is the same as 640x480. I don't know what the difference is between that and vga other than that's probably 50hz or lower, so you could try that.

kristjan1111

@ballboff I got that done, but the text still flickers a little bit and also the lines flicker.

thelostsoul

If you still have trouble, you maybe interested into an adapter that converts hdmi to vga. This is the way I set up my 640x480p vga monitor.

ballboff

@kristjan1111 said in I have problems with my 640x480 tft display:

@ballboff I got that done, but the text still flickers a little bit and also the lines flicker.

Don't know then. There may be some other setting that I'm missing, but you shouldn't need an adapter. The composite is designed for this purpose and you'd think the standard resolution would be suitable.